Pump.



0.1). LUCAS.

PUMP.

APPLICATION FILED MAR.27. 1915.

Patented Aug. 31, 1915.

3 SHEETS-SHEET 1.

coLuMNA PMNOGRAPH CO.,WASH1NOTON, D. c

0. D. LUCAS.

PUMP.

APPLICATION FILED MAR.27| l9l 5.

1,1 52,1 Patented Aug. 31, 1915.-

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l 6 f 3 Q .0. D. LUCAS.

3 SHEETS-SHEETS.

COLUMBIA PLANODRAPH co WASHINGTON. D- c.

Patented Aug. 31, 1915.

- s' 'raas; PATENT rnion ownn nAvIn LnoAs or wris'rlvrrns'rnn, LONDON, etres;

To all whom it may 0011061721,:

' Be it known that I, OWEN Davin LUoAs,

a subject of the King of Great Britaim residing at 39 Victoria street, l/Vestminster,

London, England, have invented new and useful Improvements in Pumps, of which the following. isa specification.

This invention relates toimprovements in pumps especially adapted for pumpingpeat, sewage and the like, the;objec.t of the invention being to overcome the clogging of the suction and discharge valves which occurs in such pumps.

According to this invention a piston valve solely operating the discharge port of the pump is controlled by a valve automatically brought into the open position by the pressure in the pump barrel at the beginning of the delivery stroke. For this purpose one end of the piston valve which controls the discharge port is in communication with the pump barrel through a by pass, the valve being brought into the closed position by a spring or by bringing a second piston valve connected to the first piston and which operates the discharge of a second barrel into its open position.

The suction is controlled by a mechanically operated piston valve which comprises four pistons arranged in pairs, the central pistons being adapted to open or close the suction port the outer pistons being situated beyond the port even when the valve is in either of its extreme positions; suction takes place through the space between the central pistons.

The invention is illustrated in the accompanying drawings in which Figure l is a longitudinal section partly in elevation showing a two-barrel pump constructed in accordance with this invention, Fig. 2 is a horizontal section of the suction valve box, Fig. 3 is a section of the delivery valve box, and Fig. 4 shows a modified form of delivery valve. Fig. 5 is a plan view of the pump.

Referring to Fig. 1, a is a pump barrel, 6 is its piston actuated in any convenient manner through a rod 0 and shown at the end of its delivery stroke; the corresponding barrel and piston which will be at the end of its suction stroke is indicated in Fig. 5.

d is a delivery valve box arranged at right angles to the barrels and referring to Fig. 3 e is a port connecting the barrel a with a disspecification of Letters Patent. Aug; 31 1915'; Application filed March 27, 1915. Serial No, 17539 Charge rific f nd a," is port conne t ng it ith t e Other barr l,

nd r pi on al es separated by mi ar bypas c nn cting t e other barrel with theother piStQn valve 7 t are t ps hic lim t the tra e f he P stons r and; r. e

2' s, a uc on val e ox conne ing the bar rel a with a suction orifice j through a port in and'the other barrel-through a" port. In.

Z 1s a piston valve comprising pistons an m and a n and connected through a link 0 to an arm p which rocks about a shaft 7) and is operated through a short arm 9 and rod 9 in any convenient manner.

The apparatus works as follows: In the position shown the pistons are at the end of their respective strokes the suction port leading to the barrel a being open while the port is leading to the other barrel is closed. The discharge port e leading to the barrel a is supposed open while the port 6' is closed. The pressure in the barrel whose p1ston is beginning its delivery will now through the by pass it act upon the piston. 7" and move it to uncover the port 6. When the pressure on the piston 0" ceases the spring 8 will return it to its original position, the piston r being then moved in its turn to uncover its port by the pressure in the other barrel.

In place of employing pistons separated by a spring they may be rigidly connected together as shown in Fig. 4 in which 9 g are the pistons operating the ports 6 e. In this case the apparatus works as follows: In the position shown the pistons are at the end of their respective strokes the suction port k leading to the barrel a being open while the port is leading to the other barrel is closed. The discharge port 6 leading to the barrel a is supposed open while the port 6 is closed. The pressure in the barrel whose piston is beginning its delivery will now, through the by pass It act upon the piston g and move it and the piston g rigidly connected therewith into the position shown in Fig. 4 the pressure on the piston 9 having been removed by the suction in the barrel a acting through the by pass it. When delivery is complete and the barrel a commences its delivery stroke the piston 9 will be exposed to pressure While the pressure on the piston 9' will be removed by suction.

that I claim is I 1. In a pump the combination With an even number of pump barrels, of means for controlling the suction ports, a pair of piston valves solely controlling both discharge ports of each pair of barrels, means for con necting one of the pair of barrels to one piston valve and means for connecting the other barrel to the other piston valve.

2. In a pump the combination With an even number of pump barrels, of means for controlling the suction ports, a pair of piston valves solely controlling both discharge ports of each pair of barrels, a by pass for connecting one of the pair of barrels to one piston valve and a by pass for connecting the other barrel to the other piston valve.

3. In a pump the combination With an. even number of pump barrels, of means for controlling the suction ports, a pair of piston valves solely controlling both discharge ports of each pair of barrels, and located at right angles to the same, a by pass for connecting one of the pair of barrels to one piston valve and a by pass for connecting the other barrel to the other piston Valve.

4:. In a pump the combination With an even number of pump barrels, of means for controlling the suction ports, a pair of piston valves separated by a spring solely controlling both discharge ports of each pair of barrels, means for connecting one of the pair of barrels to one piston valve and means for connecting the other barrel to the other piston valve.

OWEN DAVID LUCAS.

Witnesses:

JOHN H. WI-IITEHEAD, WV. J. SKERTEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

